Izdana je zakrpa koja rješava sigurnosni propust u radu jezgre operacijskog sustava FreeBSD. Udaljeni napadač ga može iskoristiti za otkrivanje informacija, povećanje ovlasti te DoS (eng. Denial of Service) napad.
Paket:
Linux kernel 3.x
Operacijski sustavi:
FreeBSD 7.4, FreeBSD 8.1, FreeBSD 8.2
Kritičnost:
7.2
Problem:
pogreška u programskoj komponenti
Iskorištavanje:
udaljeno
Posljedica:
dobivanje većih privilegija, otkrivanje osjetljivih informacija, uskraćivanje usluga (DoS)
Rješenje:
programska zakrpa proizvođača
CVE:
CVE-2012-0217
Izvorni ID preporuke:
FreeBSD-SA-12:04.sysret
Izvor:
FreeBSD
Problem:
Sigurnosna ranjivost je posljedica rada paketa FreeBSD/amd64 na procesorima različitog ponašanja što može dovesti do pogrešnog povratka iz sistemskih poziva.
Posljedica:
Udaljeni napadač spomenutu ranjivost može iskoristiti za dobivanje većih privilegija, otkrivanje podataka te napad uskraćivanjem usluga (DoS).
Rješenje:
Svim se korisnicima navedenog programskog paketa, u svrhu zaštite sigurnosti, savjetuje korištenje dostupnih nadogradnji i zakrpa.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
=============================================================================
FreeBSD-SA-12:04.sysret Security Advisory
The FreeBSD Project
Topic: Privilege escalation when returning from kernel
Category: core
Module: sys_amd64
Announced: 2012-06-12
Credits: Rafal Wojtczuk, John Baldwin
Affects: All supported versions of FreeBSD
Corrected: 2012-06-12 12:10:10 UTC (RELENG_7, 7.4-STABLE)
2012-06-12 12:10:10 UTC (RELENG_7_4, 7.4-RELEASE-p9)
2012-06-12 12:10:10 UTC (RELENG_8, 8.3-STABLE)
2012-06-12 12:10:10 UTC (RELENG_8_3, 8.3-RELEASE-p3)
2012-06-12 12:10:10 UTC (RELENG_8_2, 8.2-RELEASE-p9)
2012-06-12 12:10:10 UTC (RELENG_8_1, 8.1-RELEASE-p11)
2012-06-12 12:10:10 UTC (RELENG_9, 9.0-STABLE)
2012-06-12 12:10:10 UTC (RELENG_9_0, 9.0-RELEASE-p3)
CVE Name: CVE-2012-0217
For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:http://security.FreeBSD.org/>.
I. Background
The FreeBSD operating system implements a rings model of security, where
privileged operations are done in the kernel, and most applications
request access to these operations by making a system call, which puts
the CPU into the required privilege level and passes control to the
kernel.
II. Problem Description
FreeBSD/amd64 runs on CPUs from different vendors. Due to varying
behaviour of CPUs in 64 bit mode a sanity check of the kernel may be
insufficient when returning from a system call.
III. Impact
Successful exploitation of the problem can lead to local kernel privilege
escalation, kernel data corruption and/or crash.
To exploit this vulnerability, an attacker must be able to run code with user
privileges on the target system.
IV. Workaround
No workaround is available.
However FreeBSD/amd64 running on AMD CPUs is not vulnerable to this
particular problem.
Systems with 64 bit capable CPUs, but running the 32 bit FreeBSD/i386
kernel are not vulnerable, nor are systems running on different
processor architectures.
V. Solution
Perform one of the following:
1) Upgrade your vulnerable system to 7-STABLE, 8-STABLE, or 9-STABLE,
or to the RELENG_7_4, RELENG_8_3, RELENG_8_2, RELENG_8_1, or RELENG_9_0
security branch dated after the correction date.
2) To update your vulnerable system via a source code patch:
The following patches have been verified to apply to FreeBSD 7.4,
8.3, 8.2, 8.1 and 9.0 systems.
a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
# fetch http://security.FreeBSD.org/patches/SA-12:04/sysret.patch
# fetch http://security.FreeBSD.org/patches/SA-12:04/sysret.patch.asc
b) Apply the patch.
# cd /usr/src
# patch < /path/to/patch
c) Recompile your kernel as described in
<URL:http://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the
system.
3) To update your vulnerable system via a binary patch:
Systems running 7.4-RELEASE, 8.3-RELEASE, 8.2-RELEASE, 8.1-RELEASE,
or 9.0-RELEASE on the i386 or amd64 platforms can be updated via the
freebsd-update(8) utility:
# freebsd-update fetch
# freebsd-update install
VI. Correction details
The following list contains the revision numbers of each file that was
corrected in FreeBSD.
CVS:
Branch Revision
Path
- -------------------------------------------------------------------------
RELENG_7
src/sys/amd64/amd64/trap.c 1.319.2.14
RELENG_7_4
src/UPDATING 1.507.2.36.2.11
src/sys/conf/newvers.sh 1.72.2.18.2.14
src/sys/amd64/amd64/trap.c 1.319.2.12.2.2
RELENG_8
src/sys/amd64/amd64/trap.c 1.332.2.24
RELENG_8_3
src/UPDATING 1.632.2.26.2.5
src/sys/conf/newvers.sh 1.83.2.15.2.7
src/sys/amd64/amd64/trap.c 1.332.2.21.2.2
RELENG_8_2
src/UPDATING 1.632.2.19.2.11
src/sys/conf/newvers.sh 1.83.2.12.2.14
src/sys/amd64/amd64/trap.c 1.332.2.14.2.2
RELENG_8_1
src/UPDATING 1.632.2.14.2.14
src/sys/conf/newvers.sh 1.83.2.10.2.15
src/sys/amd64/amd64/trap.c 1.332.2.10.2.2
RELENG_9
src/sys/amd64/amd64/trap.c 1.357.2.9
RELENG_9_0
src/UPDATING 1.702.2.4.2.5
src/sys/conf/newvers.sh 1.95.2.4.2.7
src/sys/amd64/amd64/trap.c 1.357.2.2.2.3
- -------------------------------------------------------------------------
Subversion:
Branch/path Revision
- -------------------------------------------------------------------------
stable/7/ r236953
releng/7.4/ r236953
stable/8/ r236953
releng/8.3/ r236953
releng/8.2/ r236953
releng/8.1/ r236953
stable/9/ r236953
releng/9.0/ r236953
- -------------------------------------------------------------------------
VII. References
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2012-0217
The latest revision of this advisory is available at
http://security.FreeBSD.org/advisories/FreeBSD-SA-12:04.sysret.asc
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.12 (FreeBSD)
iEYEARECAAYFAk/XQGgACgkQFdaIBMps37KCsACdEvLcb0JhWKmVlvq5SuKzuW1Q
fhsAnRVLFoGa2WGnRpfQrLYCjL9gs8Rd
=RvZd
-----END PGP SIGNATURE-----
_______________________________________________
Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite. mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-security-notifications
To unsubscribe, send any mail to
"Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite."
Posljednje sigurnosne preporuke